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The Increase in Frictional Resistance Caused by Various Types of Rivet Heads as Determined by Tests of Planing Surfaces (1938)
NASA Technical Reports Server (NTRS) · leaf 8
> Figure 2.- Detail of planing surface 56-D.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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